Sorrel is a color designation for a horse, especially a reddish or speckled horse. The term is used in the Revised Version in place of the older rendering “speckled.”
The word occurs in the description of the horse in Zechariah’s vision. Its use identifies the animal’s color rather than a separate kind of horse.
“Sorrel” is a translation choice. The Revised Version uses it where the King James Version has “speckled.”